Chapter 3 Quiz

What is the average salinity of seawater?

• 20%

• 10%

• 1%

• 3.5%

Which factor affects ocean temperature the most?

• ocean currents

• wind speed

• cloud cover

• solar radiation

Priya, Mia, and Aria are participating in a marine science project. They need to measure the transparency of the ocean for their project. Which unit should they use?

• Transparency index

• Secchi depth

• Water clarity

• Ocean visibility

At what depth does ocean pressure increase by 1 atmosphere?

• 5 meters

• 10 meters

• 50 meters

• 100 meters

Which element is the most abundant in ocean salt composition?

• potassium

• chlorine

• sodium

• magnesium

During a school trip to the beach, Charlotte, Luna, and Lily were curious about the blue color of the ocean. They started discussing and came up with different trace elements that might be responsible. Which trace element did they conclude is responsible for the blue color of the ocean?

• zinc

• iron

• cobalt

• manganese

What is the primary source of ocean salinity?

• Evaporation of seawater.

• Volcanic activity.

• Marine organisms.

• Weathering of rocks on land

Which layer of the ocean experiences the highest temperature?

• thermocline

• surface layer

• abyssal zone

• mesopelagic zone

What is the average depth of the ocean?

• 10,000 meters

• 3,800 meters

• 2,000 meters

• 5,000 meters

Michael, Mason, and Elijah are on a beach vacation. They notice that they can float more easily in the ocean than in their hotel pool. They start discussing why this might be. Which property of seawater do you think affects its density the most, leading to their observation?

• salinity

• temperature

• pressure

• oxygen content